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Power Steering Oil Pressure Switch

  1. Disconnect switch connector at pump. Using DVOM, check continuity between switch and vehicle ground. Continuity should not exist with wheels straight ahead and engine idling. Continuity should be present when wheels are turned.
  2. Check continuity of circuit between switch and ECM. Disconnect power steering oil pressure switch connector and ECM connector. Connect jumper wire between ECM terminal and vehicle ground. See POWER STEERING PRESSURE SWITCH ECM TERMINAL NUMBER  table. Using DVOM, check for continuity between switch harness connector and vehicle ground. Check and repair circuit if no continuity exists. Go to step 3 if continuity exists.
  3. Connect ECM connector. Turn ignition on. Using DVOM, measure voltage at switch harness connector. System is okay if battery voltage exists. Replace ECM if voltage does not exist.
    POWER STEERING PRESSURE SWITCH ECM TERMINAL NUMBER

    Application (1) Terminal Number
    California (Connector C50-6) 2
    Federal (Connector C50-1) 8
    (1) See Figure and Figure .
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